class B{
    int n;
    static int sum = 0;
    void setN(int n){
	this.n = n;
    }
    int getSum(){
	for(int i=1;i<=n;i++)
	  sum= sum+i;
  	return sum;
    }
}
public class A3{
    public static void main(String x[]){
	B b1 = new B(),b2 = new B();
	b1.setN(3);
	b2.setN(5);
	int s1 = b1.getSum;
	int s2 = b2.getSum;
	System.out.println(s1+s2);
    }
}